I have FTA dish pointing at 116.9 ku I want to add an LNBF to be able to receive 113.Ku and another LNBF for 103. KU.. I am only able to get 121 w and 123 west Ku.. could someone tell the tricks in add a extra LNBF to a FTA dish.. The center LNBF is pointing to 116.9Ku